JP2570613Y2 - Discharge rate variable pump - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump for pumping a fixed amount of liquid contained in a stationary type container, for example.
In particular, it relates to a pump having a variable discharge amount.

[0002]

2. Description of the Related Art A conventional pump of this type is a variable volume pump having a cylindrical tank having a liquid chamber therein and a piston slidably inserted into the tank to change the volume of the liquid chamber. Type is common. That is, the liquid in the container can flow into the liquid chamber through a suction passage such as a pipe. On the other hand, a shaft member extending to the outside of the tank is connected to the piston, and the shaft member is provided with a discharge passage for discharging the liquid in the liquid chamber to the outside. The suction passage and the discharge passage are provided with a suction valve mechanism and a discharge valve mechanism, respectively.

[0003] In the suction operation, the piston is moved in a direction to enlarge the volume of the liquid chamber with the discharge valve mechanism closed and the suction valve mechanism opened, so that the inside of the liquid chamber is set to a negative pressure and the liquid in the container is discharged from the suction port. Into the liquid chamber. This movement of the piston is normally performed automatically by a spring force or the like.

The discharge operation is performed by moving the piston in a direction to reduce the volume of the liquid chamber with the discharge valve mechanism opened and the suction valve mechanism closed, thereby compressing the liquid in the liquid chamber and discharging the liquid. Through which the liquid is discharged.

The shaft member is guided slidably in the axial direction by a guide member provided on the tank.
A stopper portion is provided between the shaft member and the guide member to abut against each other in the axial direction to regulate the strokes of the piston in the suction direction and the discharge direction. The discharge amount was set.

[0006]

However, in the case of the above-mentioned prior art, although there is an advantage that a fixed amount can always be discharged, even if a small amount is used, the discharge is extra, which is uneconomical. become. In addition, when it is desired to use a large amount, it is necessary to perform the operation many times, and there is a problem that the usability is poor.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a pump having a variable discharge amount.

[0008]

According to the present invention, in order to achieve the above object, a cylindrical tank having a liquid chamber inserted therein and having a liquid chamber therein is slidably inserted into the tank. A piston having one end connected to the piston and the other end extending out of the tank; a suction passage for sucking the liquid in the container into the liquid chamber of the tank; A state in which a discharge passage for discharging liquid to the outside through the shaft member, a suction valve mechanism for opening and closing the suction passage, and a discharge valve mechanism for opening and closing the discharge passage, wherein the discharge valve mechanism is closed and the suction valve mechanism is opened By moving the piston in the suction direction to increase the volume of the liquid chamber, the liquid in the container is sucked into the liquid chamber from the suction port by negative pressure in the liquid chamber, the discharge valve mechanism is opened, and the suction valve mechanism is closed. Liquid A guide member that guides the shaft member slidably in the axial direction by moving the piston in a discharge direction that contracts the volume of the chamber to compress the liquid in the liquid chamber and discharge the liquid through the discharge passage. A pump for setting a predetermined discharge amount by providing a stopper portion between the guide member and the shaft member for restricting the stroke of the piston by making contact with each other in the axial direction. A movably guided stem and a nozzle portion provided at the tip of the stem are provided, and the guide member has a female screw portion provided on the inner periphery of an upper end opening thereof,
A stem guide which is located inward of the tank with respect to the female thread portion and whose outer periphery of the stem is in sliding contact with the stem guide, wherein the stopper portion is provided on the lower end surface of the stem guide so as to have a different phase in the rotational direction and axially protrudes; And a plurality of protrusions that protrude in the axial direction from the annular step portion of the stem and selectively match the protrusions on the lower end surface of the stem guide to change the stroke end position in the suction direction of the piston. Configuration, while
A screw is provided on the guide member at the lower end of the nozzle.
A male screw portion capable of being screwed into the portion is provided so that the nozzle portion can be locked to the guide member.

Further, the shaft member is provided with a stem slidably guided by a guide member, and a nozzle portion provided at the tip of the stem. The guide member has an upper end opening, a stem guide stem outer peripheral sliding contact provided located in the tank side than the upper opening, the stopper portion, the fitting tube portion of the nozzle portion where the tank out of the stem is fitted
A stopper protrusion which is partially provided on the outer circumference, the guide members plurality disposed within a circumferential top opening the stopper projection is selectively different stroke end position of the ejection direction in contact with the height of the variable And a lock groove in which the stopper projection is rotatable in the rotation direction.

The lock groove is provided at the lowest step.
It is characterized by

The variable discharge pump according to claim 1 is
By rotating the shaft member and the guide member relative to each other, a plurality of protrusions and an annular
Selectively match the multiple projections provided on the step,
Change the stroke end position in the suction direction. Suction direction
Change the stroke end position to a position where the stroke increases
Then, the suction volume to be discharged increases by that much,
At a certain position, the suction amount to be discharged is reduced. Also,
When locking, guide the external thread of the nozzle at the bottom.
Since it is provided at the upper end opening of the member,
Click.

On the other hand, in the variable discharge pump according to the second aspect, the shaft member and the guide member are relatively rotated to fit the nozzle portion into which the stem outside the tank is fitted.
The stroke end position in the ejection direction is changed by selectively matching the stopper convex portion provided on the outer periphery of the combined tube portion with a plurality of steps having different heights provided on the inner periphery of the upper end opening of the guide member. If the stroke end position in the ejection direction is set to a position where the stroke is increased, the ejection amount is increased accordingly, and if the stroke end position is decreased, the ejection amount is decreased. Then, when locking, the stopper convex portion is engaged with the lock groove provided in the step portion to lock.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiment.

FIG. 1 shows a variable discharge pump according to a first embodiment of the present invention. That is, this pump 1
A cylindrical tank 3 inserted into the container 100 and having the liquid chamber 2 therein; a piston 4 slidably inserted into the tank 3 to change the volume of the liquid chamber 2; and one end connected to the piston 4 A shaft member 5 whose other end extends outside the tank 3
And a suction passage 6 for sucking the liquid in the container 100 into the liquid chamber 2 of the tank 3, a discharge passage 7 for discharging the liquid in the liquid chamber 2 to the outside through the shaft member 5, and opening and closing the suction passage 6. And a discharge valve mechanism 9 for opening and closing the discharge passage 7 and a ring 10 constituting a guide member for slidably guiding the shaft member 5 in the axial direction.

The tank 3 is a cylindrical member having a hollow inside, and has a flange portion 11 which is engaged with an upper end surface of a mouth and neck portion 101 of the container 100 via an annular seal member 102 at an upper end thereof.
Pipe 1 constituting suction passage 6 at connection end 12 on bottom side
3 are connected. Then, while the tank 3 is inserted into the container 100, the cap 14 is screwed into the mouth and neck 101 with the flange 11 engaged with the upper end surface of the mouth and neck 101 of the container 100, and the liquid is inserted through the seal member 102. Tightened and fixed tightly.

The piston 4 is a double cylindrical member in which a piston outer cylinder 15 and a piston inner cylinder 16 are connected. The upper end of the piston inner cylinder 16 protrudes above the upper end of the piston outer cylinder 15.

The shaft member 5 is composed of a stem 17 slidably in contact with the ring 10 and a nozzle 18 provided at the tip of the stem 17.

The nozzle portion 18 includes a nozzle head 19 and a discharge pipe 20 extending laterally from a side surface of the nozzle head 19.
And a nozzle neck 21 extending vertically downward from the lower surface of the nozzle head 19 and connected to the stem 17. As shown in FIG. 2 (b), the stem 17 and the nozzle neck 21 form a straight portion 21A without a fitting surface having a perfect circular shape, as shown in FIG.

The ring 10 is a hollow plug inserted into the inner periphery of the upper end opening of the tank 3. The ring 10 is a cylindrical plug 22 fitted into the inner periphery of the upper end opening of the tank 3. 23, an annular bent portion 24 bent downward from an outer end of the flange portion 23, and a cylindrical stem guide 27 provided on the inner peripheral side of the plug body 22.
On the inner periphery of the upper half of the plug body 22, there is formed a female thread 26 to which a male thread 25 provided on the outer periphery of the nozzle neck 21 is screwed.

The male thread portion 25 and the female thread portion 26 are screwed together at the time of locking, but are removed during normal use.
When the discharge operation is performed, the lower end of the screw portion 25 is
A stopper is formed to abut the upper end in the axial direction to regulate the end position of the discharge stroke.

On the other hand, a ring 10
An annular step 28 protruding outward in the radial direction is provided on the lower end surface of the stem guide 27 so as to abut in the axial direction. The stem guide 27 and the annular step 28 abut against each other in the axial direction, and constitute a stopper for regulating the stroke end position of the piston 4 in the suction direction.

In this embodiment, the projections 43, 43 as abutting portions projecting in the axial direction from the lower end surface of the stem guide 27 provided on the ring 10 are provided at two positions in the circumferential direction with different phases in the rotating direction. On the other hand, projections 44 protruding in the axial direction are also provided on the annular step portion 28 of the stem 17 at two circumferential positions,
The case where the protrusions 43 and 44 contact each other and the case where the protrusions 43 and 44
Recesses 43A, 44A between the projections 43, 44
The two contact positions can be selected, such as when they fit into each other and come into contact with the deep end surfaces of the concave portions 43A and 44A. An engagement rib 45 is provided on the inner peripheral surface of the stem guide 27 in accordance with the phases of the projection 43 and the concave portion 43A constituting each contact portion.
Is provided with a slide groove 46 with which the. The engagement rib 45 and the slide groove 46 can move relative to each other in the axial direction, and prevent relative rotation until a predetermined force is applied in the rotational direction. Mechanism. The piston 4 is a connecting member 29
Is connected to the stem 17 through the connecting member 29.
A connecting shaft 31 extending upward and fitted on the inner periphery of the stem 17; a locking shaft 32 extending downward and projecting into the liquid chamber 2; a connecting shaft 31 and the locking shaft 32. And a seat surface forming flange 30 provided at a boundary portion between the two.

The piston 4 is mounted so as to be movable by a predetermined amount in the axial direction across the connecting shaft portion 31 and the outer periphery of the stem 17, and is axially moved by the flange 30 for forming the seat surface and the annular step portion 28 of the stem 17. Movement is regulated. A groove 36 extending in the axial direction is formed on the outer periphery of the connection shaft portion 31, and a space between the groove 36 and the inner peripheral surface of the piston inner cylinder 16 forms a part of the discharge passage 7.

The discharge valve seat 37 of the discharge valve mechanism 9 is provided on the upper surface of the flange 30 for forming the seat surface of the connecting member 29. The lower end of the inner cylindrical portion 16 of the piston 4 comes into contact with this discharge valve seat 37 and discharges. The passage 7 is opened and closed. That is, when the piston 4 moves in the suction direction, the lower end of the piston inner cylinder 16 is lowered by the negative pressure of the liquid chamber 2 and the friction between the tank 3 and the piston 4 so that the discharge valve seat 3 on the upper surface of the seat surface forming flange 30 is formed.
7, the discharge passage 7 is closed, and when the piston 4 moves in the discharge direction, the piston 4 is pushed upward by the compression pressure of the liquid in the liquid chamber 2, and the piston 4 is pushed upward from the discharge valve seat 37 of the seat surface forming flange 30. The discharge passage 7 is opened apart. At this time, the upper end of the piston inner cylinder 16 is in close contact with the lower end surface of the annular step portion 28 protruding from the outer periphery of the stem 17 so as to prevent liquid leakage from the discharge passage 7.

A piston urging spring 33 for urging the piston 4 upward is mounted in the liquid chamber 2. The piston biasing spring 33 is a coil spring. The upper end is engaged with a spring seat 34 provided on the lower end surface of the seat surface forming flange 30, and the lower end is engaged with a spring seat 35 formed on the inner periphery of the lower end of the tank 3. I have. on the other hand,
A ball 38 is used for the suction valve mechanism 8. That is, a valve chamber 39 into which a ball 38 is inserted movably in the axial direction is provided at the lower end of the tank 3.
A suction valve seat 40 is provided at the lower end side of the nozzle 9 so that the ball 38 comes in contact with and separates from the ball 38. At the time of locking, the ball 38 is pressed against the suction valve seat 40 via the locking spring 41 by the locking shaft 32.

The locking operation is performed by connecting the external thread 25 of the nozzle neck 21 of the nozzle 18 to the plug 22 of the guide member 10.
In order to provide the ball on the inner circumference, it is screwed into the screw portion 26 and fixed. In this state, the tip of the locking shaft portion 32 enters the valve chamber 39 to move the locking spring 41 downward, and then compresses the ball 38. The suction valve seat 40 is pressed. The locking spring 41 is formed integrally with the piston urging spring 33 by a single wire.

The lower surface of the seat surface forming flange 30 of the connecting member 29 can be in close contact with a fitting portion inner peripheral surface 51 formed at a predetermined position inside the tank 3 outside the spring seat 34. A cylindrical portion 52 is provided.

A container 100 is provided on the upper side surface of the tank 3.
An air hole 42 that allows air to flow between the inside and the outside is opened, and this air hole 42 is opened in a minute gap formed inside the plug body 22 and the tank 3.

In the variable discharge rate pump of the first embodiment having the above-described structure, the pump is used in a locked state during transportation or the like (see FIG. 5) and in a use state with a large discharge amount (see FIGS. 1 (a) and (a)). (See b)) and small discharge volume usage (see Fig. 4 (a) and (b))
There are three kinds of embodiments.

In the locked state, as shown in FIG. 5, the nozzle head 1 is pressed against the spring force of the piston urging spring 33.
9 is pressed down, and the external thread portion 25 on the outer periphery of the nozzle neck portion 31 is screwed into the internal thread portion 26 on the inner periphery of the plug body portion 22 of the ring 10 to be tightened and fixed. In this state, the seating surface forming flange 30 has a cylindrical portion 52 and an outer peripheral surface of the fitting portion inner peripheral surface 5 provided in the tank 3.
1 and the ball 38 for the suction valve is connected to the locking shaft 3 of the connecting member 29 via the locking spring 41.
2 is pressed by the suction valve seat 40 and the container 1
00 is sealed so as not to leak the liquid inside the suction passage 6.

FIGS. 1A and 1B show a case where the discharge amount is large. For example, when the nozzle portion 18 is rotated from the locked state to remove the nozzle portion 18 from the ring 10, the spring 33 The piston 4 is pushed upward through the connecting member 29 by the force, and the inside of the liquid chamber 2 inside the tank 3 becomes a negative pressure, the ball 38 separates from the suction valve seat 39 and the liquid in the container 100 flows through the suction passage. It is sucked into the liquid chamber 2 through 6. At this time, the lower end of the piston inner cylinder 16 is in close contact with the discharge valve seat 37 of the ring seat surface forming flange 30 due to the negative pressure and friction in the liquid chamber 2 to close the discharge passage 7.
On the other hand, outside air is introduced into the inside of the container 100 through an air hole 42 provided at the upper end of the tank 3 to eliminate the negative pressure inside the container 100.

When the discharge amount is large, the protrusion 43 provided on the lower end surface of the stem guide 27 of the ring 10 and the annular stepped portion 2
The projections 44 provided on the upper end surface of the projection 8 are set at positions where they are shifted in phase and fit into the recesses 43A, 44A.

Next, in the discharging operation, the nozzle 4 is pushed down to push the piston 4 through the stem 17 to compress the liquid in the liquid chamber 2. This pressure causes the suction valve mechanism 8
The ball 38 is pressed by the suction valve seat 40, and the suction passage 6 is closed. On the other hand, the piston 4 is separated from the discharge valve seat 37 provided on the upper surface of the seating surface forming portion 30 by the pressure of the liquid, opens the discharge passage 7, and is discharged from the nozzle portion 18 through the discharge passage 7. At this time, the distal end of the piston inner cylinder 16 is in close contact with the lower end surface of the annular step portion 28 provided on the stem 17 to seal leakage of liquid from the gap between the piston 4 and the stem 17.

The lower end of the external thread 25 provided on the outer periphery of the nozzle neck 21 is connected to the plug 22 of the contact ring 10.
The discharge stroke end position is regulated at the time of contact with the upper end of the internal thread portion 26 on the inner periphery.

FIGS. 4A and 4B show the discharge state when the discharge amount is small.

When the discharge amount is small, the guide member 1
The protrusion 43 provided on the lower end surface of the stem guide 27 and the protrusion 44 provided on the upper end surface of the annular step 28 abut against each other, and the suction stroke is reduced by that much compared to FIGS. 1 (a) and 1 (b). It is getting smaller. On the other hand, as shown in FIG. 4B, the end position of the discharge stroke is the lower end of the external thread 25 of the nozzle 18 and the internal thread 2 of the ring 10 as in the case of FIG.
6 is a contact position with the upper end, and eventually the stroke of the piston 4 is reduced by the lowering of the suction stroke end position.

The operation of selecting the discharge amount is performed by rotating the nozzle portion 18 integrally connected to the stem 17 relative to the ring 10. Since the engagement rib 45 and the slide groove 46 that engage with each other are provided at the position where the discharge amount is large and the position where the discharge amount is small, a sense of moderation when the engagement rib 45 is engaged with and disengaged from the slide groove 46 is provided. Positioning can be easily and intuitively performed. In addition, the pump is rotated during the pumping so that the discharge amount other than the desired discharge amount is not discharged.

In this embodiment, the position where the slide groove 46 and the engagement rib 45 coincide with each other is unknown whether the position where the discharge amount is large or small. Sorting is possible by visual inspection by attaching the mark. In addition, for example, by changing the sense of resistance when the engagement rib 45 is disengaged from the slide groove 46, that is, the sense of moderation, it is also possible to select only by the sense of the hand without visual observation.

FIGS. 6 to 8 show a variable displacement pump according to a second embodiment of the present invention. This pump has basically the same configuration as the pump of the first embodiment, except for the stem guide 27 of the ring 10 and the nozzle portion 1.
8 is provided with a stopper portion that allows the stroke end position on the discharge side to be selected.

That is, on the outer periphery of the fitting tube portion 21 of the nozzle portion 18, stopper projections 47 projecting from the outer periphery are formed at two places in the circumferential direction. A female thread is not provided on the circumference as in the first embodiment, and first and second step portions 48 and 49 are formed so that the stopper convex portion 47 selectively abuts in the axial direction. .

The second step 49 is used for locking.
Is formed with a lock groove 50 for locking.

FIG. 6 shows a free state, that is, a state in which the piston is pushed up by the piston urging spring 33 and the suction of the liquid into the liquid chamber is completed. In this state, the piston is at the stroke end position in the suction direction, and the stroke end position is regulated not by the stem guide 27 and the annular step portion 28 but by the plug body of the upper end of the piston outer cylinder 15 and the ring 10 in this embodiment. This is performed at the lower end of the part 22.

FIG. 7A shows a discharge completion state when the discharge amount is small, and the stopper projection 47 of the nozzle portion 18 is shown.
Abuts the first step portion 48 on the inner periphery of the plug body portion 22 of the ring 10 to regulate the discharge stroke.

FIG. 7B shows a discharge completion state in the case where the discharge amount is large, and by rotating the nozzle portion 18 and the ring 10 relatively from the state of FIG. The phases of the convex portion 47 and the first step portion 48 are shifted.
When the nozzle portion 18 is pushed down in this state, the stopper convex portion 47 passes through the first step portion 48 and abuts on the second step portion 49, and the stroke is increased by the step difference.

FIG. 8 shows a locked state, in which the nozzle portion 18 and the ring 1
0 relative to the nozzle portion 18
Lock groove 5 provided with stopper projection 47 on ring 10
0 and fixed so as not to move in the axial direction.

Since the other construction is completely the same as that of the first embodiment, the same components are denoted by the same reference numerals and their description is omitted.

FIGS. 9 and 10 show a variable displacement pump according to a third embodiment of the present invention.

In the third embodiment, the structure of the stopper for regulating the discharge stroke is the same as that of the first embodiment.
Three points: a valve with a spring is used as the suction valve mechanism 8 and the discharge valve mechanism 9, a point where the stem 17 and the piston 4 are integrated, and a point where the cap 14 and the ring 10 are integrated. This is greatly different from the first embodiment. Hereinafter, only different points will be described.

The valve with spring constituting the suction valve mechanism 8 and the discharge valve mechanism 9 is basically a movable valve body 61.
And the mounting portion 62 to be fixed, the valve body portion 61 and the mounting portion 62
And a spring portion 63 interposed between the valve body portion 61, the valve body portion 61, the mounting portion 62, and the spring portion 63 are integrally formed of resin. The spring portion 63 is composed of a plurality of elastic pieces, each of which is spirally arranged. The mounting portion 62 of the valve with spring used in the suction valve mechanism 8 has a cylindrical shape with an inward flange, and is fitted on the outer periphery of an annular convex portion 81 protruding from the bottom surface of the tank 3. The valve body portion 61 is pressed against the suction valve seat 40 by the spring force of the spring portion 63 to keep the suction passage 6 in a normally closed state.

On the other hand, the spring-equipped valve used in the discharge valve mechanism 9 has a mounting portion 62 in a ring shape and is fixed to the upper end of the stem 17. And the spring part 6
The valve body 61 is inserted into the stem 17, and the valve body 61 is pressed against a discharge valve seat 91 formed on the inner periphery of the stem 17 by the spring force of the spring portion 63 to always close the discharge passage 7. Hold in state.

Since the spring valve is used as the discharge valve mechanism 9, the piston 4 and the stem 1
It is not necessary to form the piston 4 and the stem 17 separately from each other. With the integral structure, the connecting member 31 for connecting the piston 4 and the stem 17 is not required, so that the structure can be simplified and the number of parts can be greatly reduced.

Further, since both the suction valve mechanism 8 and the discharge valve mechanism 9 are held in a closed state by using a valve with a spring, it is not necessary to separately provide a lock mechanism at the time of locking and overturning. The structure can be simplified and the number of parts can be reduced.

On the other hand, in this embodiment, the cap 14 and the ring 10 are also integrated, and the sealing member 1
02 is also omitted to reduce the number of parts. In order to reduce the number of the sealing members 102, in the illustrated example, a sealing projection 103 is provided on a surface where the upper end of the container neck portion 101 and the flange portion 11 at the upper end of the tank 3 contact. Of course, the sealing projection 103 may be formed on the tank 3 side.

The other configuration is completely the same as that of the first embodiment, and therefore, the same components are denoted by the same reference numerals and description thereof will be omitted.

[0055]

[Effects of the Invention] The present invention has the above configuration and operation, and has a stroke end in the suction direction or the discharge direction.
By rotating the shaft member and the guide member relative to each other.
The discharge position can be changed by simple operation because the regulation position is variable
And to provide a lock
Therefore, it is possible to lock the nozzle portion with respect to the guide member.
it can.

In particular, in the invention according to the first aspect, the stopper portion is provided.
Is provided inside the tank, so the guide member and nozzle
Can be firmly locked by the screw part provided in the. In addition,
In the invention according to claim 2, the stopper is located outside the tank.
However, the stem is rotated to engage the stopper projection with the lock groove.
Can be locked.

[Brief description of the drawings]

FIGS. 1A and 1B show a large discharge amount state of a variable discharge amount pump according to a first embodiment of the present invention. FIG. 1A is a longitudinal sectional view of a suction state, and FIG. FIG.

2 (a) is a schematic exploded perspective view of a main part of the pump of FIG. 1, and FIG. 2 (b) is a sectional view of a fitting portion between a nozzle neck and a stem.

3 (a) to 3 (c) show a guide member of the pump of FIG. 1; FIG. 3 (a) is a longitudinal sectional view, FIG. 3 (b) is a plan view,
3 (c) shows a bottom view, FIGS. 3 (d) and 3 (e) show stems, FIG. 3 (d) is a front view, and FIG. 3 (e) is a plan view.

FIG. 4 shows a state in which the discharge amount of the pump according to the first embodiment of FIG. 1 is small, and FIG. 4 (a) is a longitudinal sectional view of the suction state, and FIG.
(b) is a longitudinal sectional view of the discharge state.

FIG. 5 is a longitudinal sectional view showing a locked state of the pump of the first embodiment.

FIG. 6 shows a variable discharge pump according to a second embodiment of the present invention, wherein FIG. 6 (a) is a vertical sectional view of a free state, and FIG.
2 is a longitudinal sectional view of the ring, and FIG. 2C is a plan view of FIG.

7 is a view showing a discharge state of the pump of FIG. 6, wherein FIG. 7 (a) is a sectional view of a state of a small discharge amount, and FIG. 7 (b) is a longitudinal sectional view of a state of a large discharge amount. is there.

FIG. 8 is a longitudinal sectional view showing a locked state of the pump of FIG. 6;

FIGS. 9A and 9B show a variable discharge pump according to a third embodiment of the present invention. FIG. 9A is a longitudinal sectional view showing a small discharge amount, and FIG. 9B is a large discharge amount. 5 (c) is a cross-sectional view taken along line CC of FIG. 5 (a), and FIG. 6 (d) is a cross-sectional view taken along line DD of FIG. 6 (b).

10 (a) is a longitudinal sectional view of the locked state of the pump of the third embodiment of FIG. 9, FIG. 10 (b) is a sectional view showing the suction valve mechanism taken out, and FIG. 10 (c) is the same. Fig. (B) plan view, Fig. (D)
FIG. 3 is a cross-sectional view showing the discharge valve mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Discharge variable pump 2 Liquid chamber 3 Tank 4 Piston 5 Shaft member 6 Suction passage 7 Discharge passage 8 Suction valve mechanism 9 Discharge valve mechanism 10 Ring (guide member) 14 Cap 17 Stem (shaft member) 18 Nozzle part (shaft member) 25 Male thread part 26 Female thread part 27 Stem guide (stopper part) 28 Annular step part (stopper part) 29 Connecting member 30 Seat forming flange 32 Locking shaft part 33 Piston biasing spring 34, 35 Spring seat 36 Groove 37 Discharge Valve seat 38 Ball for suction valve 39 Valve chamber 40 Suction valve seat 41 Spring for locking 42 Air hole 43, 44 Projection (contact part) 43A, 44A Depression (contact part) 45 Engagement rib 46 Slide groove 47 Projection for stopper Portion (stopper portion, contact portion) 48, 49 First and second step portions (stopper portion, contact portion) 50 Lock groove

Claims (3)

(57) [Scope of request for utility model registration] 1. A cylindrical tank having a liquid chamber inserted therein and having a liquid chamber therein, a piston slidably inserted into the tank and having a variable volume, and one end connected to the piston. A shaft member having an end extending outside the tank, a suction passage for sucking the liquid in the container into the liquid chamber of the tank, a discharge passage for discharging the liquid in the liquid chamber to the outside through the shaft member, and opening and closing the suction passage. A suction valve mechanism that opens and closes the discharge passage, and a piston that moves in a suction direction that expands the volume of the liquid chamber with the discharge valve mechanism closed and the suction valve mechanism opened. By moving the piston in the discharge direction to reduce the volume of the liquid chamber while the discharge valve mechanism is opened and the suction valve mechanism is closed with the interior of the chamber being negative pressure and the liquid in the container being sucked into the liquid chamber from the suction port. A guide member that guides the shaft member slidably in the axial direction, and a shaft is provided between the guide member and the shaft member. A pump that is provided with a stopper that regulates a stroke of a piston by abutting each other in a direction to set a predetermined discharge amount. The stem includes a stem slidably guided by a guide member, and a tip of the stem. The guide member is provided with a female thread provided on the inner periphery of the upper end opening thereof, and a stem guide which is located inward of the tank with respect to the female thread and is in sliding contact with the outer periphery of the stem. A plurality of axially projecting protrusions provided on the lower end surface of the stem guide in different phases in the rotational direction, and the lower end surface of the stem guide axially projecting on an annular step portion of the stem; The suction direction of the stroke end position of the piston is configured to include a plurality of protrusions which varies selectively in line with the projection, on the other hand, provided on the guide member to the nozzle portion the lower end
It provided screwable male screw portion into the female screw portion, a discharge amount variable pump, characterized in that to enable locking the nozzle unit relative to the guide member. 2. A cylinder-shaped tank inserted into a container and having a liquid chamber therein, a piston slidably inserted into the tank to change the volume of the liquid chamber, and one end connected to the piston. A shaft member having an end extending outside the tank, a suction passage for sucking the liquid in the container into the liquid chamber of the tank, a discharge passage for discharging the liquid in the liquid chamber to the outside through the shaft member, and opening and closing the suction passage. A suction valve mechanism that opens and closes the discharge passage, and a piston that moves in a suction direction that expands the volume of the liquid chamber with the discharge valve mechanism closed and the suction valve mechanism opened. By moving the piston in the discharge direction to reduce the volume of the liquid chamber while the discharge valve mechanism is opened and the suction valve mechanism is closed with the interior of the chamber being negative pressure and the liquid in the container being sucked into the liquid chamber from the suction port. A guide member that guides the shaft member slidably in the axial direction, and a shaft is provided between the guide member and the shaft member. A pump that is provided with a stopper portion that regulates the stroke of the piston by abutting each other in the direction to set a predetermined discharge amount. The shaft member has a stem slidably guided by a guide member, The guide member is provided with an upper end opening thereof, and a stem guide which is located inward of the tank with respect to the upper end opening and in which the outer periphery of the stem is in sliding contact with the guide member. Nose to which the stem outside the tank is fitted
The stopper convex portion provided partially on the outer periphery of the fitting cylindrical portion of the nozzle portion and the stopper convex portion provided on the inner periphery of the upper end opening of the guide member selectively contact to change the stroke end position in the discharge direction. A plurality of step portions having different heights, and a lock groove provided on the step portion so that the stopper projection can be engaged and disengaged in a rotational direction. 3. The pump according to claim 1, wherein the lock groove is provided at a lowermost step.